System of control.



R. E HELLIVIUND.

SYSTEM 0F CONTROL.

APPLrcATloN m50 SEPT. 9, :915.

1,287,688. meme@ De@ 1jr, w18.

Qroand.

WITNESSES H'USE ELECTRC AND l?? SLVAN.

CTU

reliable and effective. s vsteiii et the aboveintliated vhai'aetei which shall he economical in epeiatien and prevlucle the use el uhse igea a the tlyhametoi type for ahw-abili ioim or returning @ihrem to., cirmit would have tof e eeetlingly large commu atois i' over troubles. For this. reef@ sary to devise other meann suitably low voltage'to the. z L thatI are lisiesefl upon iailivaj.v vemeles to the exciting fielrvviiidihg eiffeiii't main maihiiit-s timing egehe'ative tien.

ecordiiig to 'my pfeseut iiiventieii, virle a System having the alleva-ini, desirable charaCteiSieS. luy comme f d vnainotor or -iteeqnivalent in para cuitl'elatieii t0 the armature et se lvnaniO-eltrie machines that. hasfw est voltage impressed upon itu er, Words, the main armature that is diieet v connected to the negative supply-@inuit ce.

din-toi'.

ln the arcempahyiiig flraw is a diagrammatic view O a Sy Y trol eiiiheclving my inveitioh, ami, 2 and 3. are similia? views @it eve ,mi e? mi trol that. emhefja other metil inveltioii.

peeleaton of 'Letten Pteht.

r espeotively 1l-ey and Ground; a plurality 0i, iiieeectiie machines iespectively *i tres A2. AF and A4 and il magnet windings F1, F2, F" met@ et a familiar type havilivallufi'eiinertetl armature Wincland f' and field magnet, Winding g a suitable Switching device or Control- #e shevfn cameiitienally at C, for the if et' suitably manipulating the main lines from the supply circuit, and a 11et disposed in circuit with the u winding G 0l' the d viiametor for nei-teal iii seiie-eireuit felation across the 'est-voltage mam armature A1 which is Y:ima-tml directly to the negative supplyeonfluetei Ground. The field Windel' the dyiiaiiiotoi is connected across mature winding G. The armature Y emmecte. in the seiies circuiteiitimiei to act as a bucket, that is, to -v it voltage to the regenen*eflV voltage e main armature fil. ln this Way, the la exciting Circ voltage Whifh would oheivv e he wagte@ in resistance, is, in this 'nase` alsoilietl lo); the armature winding M 'heut iheostati losses. and glieli surplus is ziieehzmicalltf traiisixiittil te the winding G, whereby excessive e @ivy ir returned to that p01'- -Hitlee the i same coi-e met shown). which is 'ed en a suitable Shaft s, whei'eby ehe-gv is mechanically transmitted between the ainiatme. xviii-dings my the core directly; wheieas. ih the ease o" a motor-generator eet, energy is mechanically transmitted by the shaft s.

ln this way, the Oi'fliuaiy type of dynaziiotm maj; lie employe since the voltage. et the arinalue A1, even in case of a supplyeicuit voltage as high as 5,000 volts, vould het. he @Ieeseive for, and would not he likely .f {lash-ever trouble ihr` the. flyiw or purpose of l'egzulatinp; the 'Ljsiiauetei and the ameuiit of uiiied t0 the main regenfil lil)

o5 case, the surplus exciting-field low Voltage to the various is identical With tl Q erative circuit, the resistor R1 may be suit ably varied, in accordance with familiar practice, as the speeds of the regenerating machines gradually decrease.

It will be understood that, while l have here shown and described my invention as embodying a dynalnotor in connection with the excitation. of the main leld windings, a suitable motor-generator set may be ein ployed if desired, the armature windings inA thatcase being connected as illustrated in Fig.' l and the various field-magnet wind ings being disposed in accordance with any suitable practice. lt will. be further understood that, if desired, the arlinature Winding G may be employed to deliver a vsuitably auxiliary devices, such as control circuits, lights, etc., upon the associated electric railway vehicle, as is customary. During the motoring and v.the regenerative operation of the main motors, current flows from the junction point between the armatures A1 and rif, through armature Winding M, and the iield windings F1 to F4', inclusive, to the return conductor Ground. Current also losvs from the gen erator armature G through the armature M, field windings ll to Fi, inclusive, and the resistor R1. A circuitl in parallel to the circuit traced through the armature G is' effect ed through'the lield winding GF; lfhe direction of current lilou through the .field windings F1 to l1 and the dynamotoris maintained unchanged whether the main machines are operating as motors or are operating as generators. However, during regenerative operation, the direction of current flow through the armatures il to A?, inclusive, is reversed and the excitation of the field windings F1 to F, inclusive, is increased.

Reference may now be had to iig. 2,l

wherein the circuit connection of the arniature Winding M of a motor-generator that replaces the previously-described dynamotor iat illustrated in Fig. l, while the generator armature winding G is connected intermediate the negative supplycircuiiL conductor Ground, and the lowervoltage terminal ol the armature Winding M. or, in other words, is connected across the scrics-connectlul lield-magnet windings of the main machines.

ln this case, the lield winding GF of the motor Agenerator is connected in circuit with a suitable variable resistor 2li/3 across the a1'- malure winding G, and a second field inagnet winding lill? for the motor generator is connected through a suitable Variable rcsistor R2 across the armature winding` M.

The operation of thc system just described will be evident from the similarity to the systcn'i. illustrated in Final. ln this energy that winding G is `machine field is derived lfrom the armature winding M by the armature winding (lr is returned directly to the exciting eld-Winding circuit rather than to the main armature winding A1, whereby a machine or' smaller capacity than that necessary in the system shown in Fig. l is required.

.it will be understood that, in order 'to vary the operation ofl the dynamotor or motor-generator set and the excitation of the main field windings as the speeds of the main machines decrease, the resistors R2 and R3 may be suitably manipulated to respectively vary the dynainotor or motor-generator set speed and the, voltage delivered by the armature wind-idg ln Fig. 3, the system. shown comprises the .nain dynamo-electric machines and the armature windings M and G of a motorenerator that replaces the-proviously-descrihcd dynamotor, together with connections to the main machine circuits that are identical with thoseillustrated in Fig. 2. However, the armature Winding lli is provided1 with a shunt field Windinr MF1 that is connected in series relation with a suitable variable resister Rf across the series-connected armature Winnings M and G, While the armature provided with a shunt fieldmagnetv Winding GFI that is connected in series relation with a suitable variable resistor R5 across the armature windings lil and (l also. A second lield Winding` (ilT2 jfor the ar1naturewinding G is connected in the mainregenerative circuit and is ditlerentially disposed with respect to the shunt field winding Gli.

ln general operation ci' the system, with the exception oi the efi'ect of the difierentially disposed field windings Gli and (lim, is similar to those already described, while the use of these field windings tends to prevent surges of regenerative current li); reason oi' relatively heavy fluctuations in the supply-circuit vol age, tor example. and Lto maintain a substantially constant regenerated current. For instance. assuming an increase of regenerated current traversing the main machine armatures and the field Winding lll. the effective exciting; tiold liuxoi tl i armature winding tionutcly decreased by reason ol' the dilierential ronnertion ot' the field windings (il and Gli?, ,'rlurcliy the excitation ol' the main windings is correspondingly decreased. and the regenerated current is rapidly reduced to the predetermined constant value desired. The differential relation of the field-magnet windings Gli" and (lll2 por so not of my present invention,

but is shown und described in my copending application,Serial No. 855,539, filed Aug. 7, lull, to which reference may loe made for further description of the operation.

l do not wish' to be restricted to the llll 

